Spending some time once a week to chop veggies, etc. to keep in the fridge. When I do it, it saves Sooo Much time later in the week. Then Sunday comes and I don't feel like it
Same thing with the garbage bags
Same thing with the store lists; I usually end up with what I don't need (I'm like a cat and endlessly distracted by something shiny) but don't get the one thing I went for
Buy two or three household cleaners and keep them in each bathroom instead of needing to go get the only one when there something I could quickly wipe down in 10 seconds.
I also need to reorganize my spice rack and baking cupboard so it won't take me 5 min to find the stuff I need